Optional OptionsetField is SilverStripe 3.2

问题

In SilverStripe 3.1.* I used some forms with OptionsetFields which are optional, so not required to make a choice. This was working well. But since i updated to SilverStripe 3.2.0 the form doesn't accept this anymore. When submit it comes with a validation message, even if I don't use validation in the whole form. See this screenshot:

This is the code of the field:

$ClassField = OptionsetField::create('Class', _t('General.CLASS', "Class"), array(
        "S" => "S",
        "E" => "E",
        "U" => "U",
        "R" => "R",
        "O" => "O",
        "P" => "P"
    ));

Any idea to make this field optional again in SilverStripe 3.2.0 ?

回答1:

This seems to be a bug in 3.2, you have now to tell OptionsetField it can be empty by using setEmptyString():

$ClassField = OptionsetField::create(
    'Class', 
    _t('General.CLASS', "Class"), 
    array(...)
)
->setEmptyString('none');

回答2:

You might be also interested in the silverstripe-display-logic module, which allows you to display certain fields based on some conditions: https://github.com/unclecheese/silverstripe-display-logic

来源：https://stackoverflow.com/questions/33732666/optional-optionsetfield-is-silverstripe-3-2